Paul is telling the Corinthian believers that their transformed lives serve as a living letter—a testimony to Christ’s work. Rather than needing a written recommendation, Paul says that their faith and conduct are proof of the gospel’s power. In this word, we are challenged to weather this could be said of each of us as believers in the Lord Jesus.
Bible Scriptures: Darby Translation
2 Corinthians 3:1-3 “Do we begin again to commend ourselves? or do we need, as some, commendatory letters to you, or [commendatory] from you?
2 *Ye* are our letter, written in our hearts, known and read of all men,
3 being manifested to be Christ’s epistle ministered by us, written, not with ink, but [the] Spirit of [the] living God; not on stone tables, but on fleshy tables of [the] heart.”